ibclogo XVI International Botanical Congess


Abstract Number: 3822
Poster No. = 1715


DO THE ORIGIN OF PLANTS AND COLLECTION TIMES AFFECT GERMINATION OF SCOTCH THISTLE CYPSELAS?


M.M. Qaderi and P.B. Cavers,Dept. of Plant Sciences, Univ.of Western Ontario,London,Canada N6A 5B7


Effects of collection times and the origin of mother plants were studied on cypselas from four populations of Scotch thistle, Onopordum acanthium. For each population, separate bulk collections were taken on two dates from plants originating from dormant and nondormant cypselas. Cypselas were stored dry for one and four months, then incubated at 25/10oC for 31 days. Overall, cypselas with nondormant origin germinated to higher percentages than those with dormant origin. However, the responses varied among different populations. Also, cypselas collected later in the season had higher germinability, a trend that disappeared with storage. More research is needed on the effects of mother plant origin to determine if selection for dormant or nondormant cypselas can change the germination responses of a natural population.


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